BELCHERTOWN – More than 100 volunteers are searching for missing Belchertown man, Michael R. “Mickey” Brougham, in the area of the New Hampshire Motor Speedway in Loudon, N.H., in the hope of either finding him or clues to his whereabouts.

The search is being conducted by the non-profit New Hampshire-based Investigative Center for Missing Children and Cold Cases, and is centering around the area where Brougham’s wallet was found in June.

Seldon E. Nason, center founder and chief investigator, said searches will be conducted all day, and besides the 100 volunteers, will feature nine dogs trained to search for cadavers, four horses and all -terrain vehicles.

“Part of our job too is to close all angles,” Nason said on Saturday.

He said there are two theories, that someone could have killed Brougham and planted his personal belongings near the speedway where he has visited in the past, or that he had a medical issue and got lost in the woods.

Brougham, 54, was last seen in Belchertown on the afternoon of June 25. Two days later, his wallet, with his identification and credit cards inside, was found outside the main gate of New Hampshire Motor Speedway and his cell phone was used near there that same day. His motorcycle and truck remained at his Belchertown home, however.

Brougham, who was a diabetic, left home without his medication and without providing extra food for his cat. He also did not tell his parents he was leaving.

Nason hopes his center’s involvement will continue to bring publicity to the case so it can be solved. He said he was pleased that so many volunteers are participating in the search.

“We have 100 people out here trying to find a guy that nobody knows,” Nason said.

No one involved in the investigation from the Belchertown Police Department was available for comment Saturday.

The family, meanwhile, has boosted the reward money for information about their missing relative to $50,000. Contributions toward the reward can be mailed to The Bring Mickey Home Reward Fund, c/o The Belchertown United Church of Christ, PO Box 603, Belchertown, MA 01007.

Anyone with information is asked to call Belchertown police at (413) 323-6685 or the state police detective unit at (413) 586-5150 or the anonymous tip line at (866) 477-8237.

The family also has set up a website about Brougham, mickybrougham.com, featuring photographs and information about him; for information about Nason’s center visit http://www.unsolvedcases.org/

Brougham’s sister, Fran A. Lofland, who is in New Hampshire for the search, said it has been well-organized and they appreciate everyone who has come out. Lofland said some people from Belchertown also drove up to help.